I have a friend that just treated her herd with this medication because of a cocidia problem. First I would like to know if there is any information out there about slaughter withdrawl. Second I would like to know if there is any other way to treat the ground besides plowing it under. Her vet told her that the only way to rid the soil of coccidia is to plow the ground under. Also that coccidia is always present, but what causes outbreak is the conditions in which it incubates depends on weather and care. Apparently it takes a hard freeze to kill this stuff and we've had a basically mild winter this year. Any help would be appreciated. Thanks!